Alt-T - Trace
 Mark the current expression/variable as a trace point.
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 This option will allow you to trace a variable or an expression. Each time a
 trace point changes, the program will halt execution and control will return
 to the debugger, where you may see the variable's new value in the watch
 window.

 You may either position the cursor on the piece of code that you wish to
 trace and press <Alt><T>, or you may position the cursor at the start of an
 expression, and mark the expression using the <Shift> ← or <Shift> → keys to
 highlight the expression that you wish to trace and press <Alt><T>.

 This will add this trace point to the watch window. If the watch window is
 not already opened it will be opened when you add a trace point, a break
 point, or a watch point.

 For an expression the trace point information contained in the trace window
 is in the form:

        <expression name>, <tp>, <contents>

 where:

        <expression name> is the actual expression that is being evaluated
        <tp> contains 'tp' for trace point, wp for a watch point
        <contents> is the actual contents of the expression